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3D models show dolphins already used narrow-band sound waves for orientation 5 million years ago
The return of cetaceans from land to the water about 50 million years ... around 5.3 million years ago. "What is particularly exciting is that these dolphins changed their habitat once again ...
Natural History Museum%2c London1y
When whales walked on four legs
Their land-dwelling ancestors lived about 50 million years ago. Meet Pakicetus, a goat-sized, four-legged creature that scientists recognise as one of the first cetaceans (the group of marine animals ...